rails-api/active_model_serializers — pull request #487 by jlecour (2014-01-09 14:24:21+00:00)
Title: Mention the `options` and `UrlHelpers` issue

As recommend by @spastorino in https://github.com/rails-api/active_model_serializers/issues/486 here is a warning about an incompatible change between `0.8` and `0.9`.